Hello,
Such kind of non itchy rash can be due to atopic dermatitis, pityriasis rosea or psoriasis. Pityriasis rosea is a common human skin disease which presents as numerous patches of pink or red oval rash. The rash may be accompanied by low-grade headache, fever, nausea and fatigue and sometimes by itching.
Psoriasis is a long-term (chronic) skin problem that causes skin cells to grow too quickly, resulting in thick, white, silvery, or red patches of skin.It is thought that psoriasis occurs when the immune system overreacts, causing inflammation and flaking of skin.
I hope it helps. Take care and regards.
Did you ever find out what this was? How was it treated?
Thanks.